中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64204-064204.doi: 10.1088/1674-1056/abd930

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Effective Hamiltonian of the Jaynes-Cummings model beyond rotating-wave approximation

Yi-Fan Wang(王伊凡), Hong-Hao Yin(尹洪浩), Ming-Yue Yang(杨明月), An-Chun Ji(纪安春), and Qing Sun(孙青)   

  1. Department of Physics, Capital Normal University, Beijing 100048, China
  • 收稿日期:2020-11-17 修回日期:2021-01-04 接受日期:2021-01-07 出版日期:2021-05-18 发布日期:2021-05-18
  • 通讯作者: Qing Sun E-mail:sunqing@cnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11875195) and the Foundation of Beijing Education Committees, China (Grant Nos. CIT&TCD201804074 and KZ201810028043).

Effective Hamiltonian of the Jaynes-Cummings model beyond rotating-wave approximation

Yi-Fan Wang(王伊凡), Hong-Hao Yin(尹洪浩), Ming-Yue Yang(杨明月), An-Chun Ji(纪安春), and Qing Sun(孙青)   

  1. Department of Physics, Capital Normal University, Beijing 100048, China
  • Received:2020-11-17 Revised:2021-01-04 Accepted:2021-01-07 Online:2021-05-18 Published:2021-05-18
  • Contact: Qing Sun E-mail:sunqing@cnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11875195) and the Foundation of Beijing Education Committees, China (Grant Nos. CIT&TCD201804074 and KZ201810028043).

摘要: The Jaynes-Cummings model with or without rotating-wave approximation plays a major role to study the interaction between atom and light. We investigate the Jaynes-Cummings model beyond the rotating-wave approximation. Treating the counter-rotating terms as periodic drivings, we solve the model in the extended Floquet space. It is found that the full energy spectrum folded in the quasi-energy bands can be described by an effective Hamiltonian derived in the high-frequency regime. In contrast to the Z2 symmetry of the original model, the effective Hamiltonian bears an enlarged U(1) symmetry with a unique photon-dependent atom-light detuning and coupling strength. We further analyze the energy spectrum, eigenstate fidelity and mean photon number of the resultant polaritons, which are shown to be in accordance with the numerical simulations in the extended Floquet space up to an ultra-strong coupling regime and are not altered significantly for a finite atom-light detuning. Our results suggest that the effective model provides a good starting point to investigate the rich physics brought by counter-rotating terms in the frame of Floquet theory.

关键词: Jaynes-Cummings model, Floquet theory, high-frequency approximation

Abstract: The Jaynes-Cummings model with or without rotating-wave approximation plays a major role to study the interaction between atom and light. We investigate the Jaynes-Cummings model beyond the rotating-wave approximation. Treating the counter-rotating terms as periodic drivings, we solve the model in the extended Floquet space. It is found that the full energy spectrum folded in the quasi-energy bands can be described by an effective Hamiltonian derived in the high-frequency regime. In contrast to the Z2 symmetry of the original model, the effective Hamiltonian bears an enlarged U(1) symmetry with a unique photon-dependent atom-light detuning and coupling strength. We further analyze the energy spectrum, eigenstate fidelity and mean photon number of the resultant polaritons, which are shown to be in accordance with the numerical simulations in the extended Floquet space up to an ultra-strong coupling regime and are not altered significantly for a finite atom-light detuning. Our results suggest that the effective model provides a good starting point to investigate the rich physics brought by counter-rotating terms in the frame of Floquet theory.

Key words: Jaynes-Cummings model, Floquet theory, high-frequency approximation

中图分类号:  (Cavity quantum electrodynamics; micromasers)

  • 42.50.Pq
42.50.-p (Quantum optics) 37.30.+i (Atoms, molecules, andions incavities)